What's your favorite rock-and-roll instrumental?

WOFX-FM -- "The Fox" in Cincinnati -- is having a "One Hit Wonders" weekend. Every few songs, they'll play a classic rock hit from a band that has had only one hit.

While picking up dinner for R, I heard "Pictures of Matchstick Men" by Status Quo, and "Hocus Pocus" by Focus.

( It's been years since I've heard that song. )

"Hocus Pocus" rocks! So...what's your favorite rock-and-roll instrumental? It doesn't have to be from a one-hit wonder. Nor does it need to have any airplay.